Security control systems are becoming faster, smarter, and less expensive, as well as better known. As a result, increased demands are being placed on these computer systems. Distributed multiprocessing (DMP) can offer a simple, cost-effective solution to the host computer slowdown and meet the most demanding architectural constraints. The DMP is in essence a processor that monitors inputs, outputs, and access control requests from a remote cabinet. Among other things, it has a real-time clock to tag activities and alarms by time, communication ports to talk to the host controller, and relays for output controls that can be initiated via its own internal data base and real-time clock. Flexibility of the DMP is the key. The DMP must be able to run independently of the host if necessary, meet all security demands of a UL-listed system, and be able to operate in the system environment. The DMP concept provides an access response approximately 3 times faster under normal loads and up to 10 times faster under heavy loads. The DMP also lends itself to a facility widely dispersed geographically. In addition to these security applications, the DMP may make it practical to use host computers for other tasks.